Arrangement in emission electrodes for electrostatic precipitators



Nov. 24, 1964 N EMISSION ELECTRODES FOR ELECTROSTATIC PRECIPITATORS Filed May 12, 1961 s. GUSTAFSSON 3,158,454 ARRANGEMENT I INVENTOR. STIG GUS TAFSSON BY WW ATTYS.

United States Patent 3,158,454 ARRANGEMENT IN EMISSION ELECTRODES FQR ELECTROSTATIC PRECIPITATORS St'ig Gustafsson, .loniroping, Sweden, assignor to Aktieholaget Svenska Fialrttabriken, Stockholm, Sweden Filed May 12, 1961, Ser. No. 109,693 iaims priority, application Sweden, May 12, 196i 4,705/69 2 Claims. (Cl. 55-152) The present invention relates to an arrangement in emission electrodes for electrostatic precipitators consisting of a number of electrode units disposed in parallel rows, each emission electrode consisting of a stifiened plate electrode equipped with projecting flaps. For an increase of the emitting effect it has been known to provide such electrodes with toothed bands or separate point elements welded to the electrodes. This is, however, not a good solution of the problem as the welding points will give rise to corrosion and added to this is the fact that the manufacture of the emission electrodes will be complicated and more expensive. The inventionthe object of which is to provide the same eflect with simple meansis characterized in that the emission electrode consists of a plane plate which is bent along its two longitudinal edges to function at each edge of the plane as a stiffening bend, forming a substantially right angle with respect to the plane through the row of the electrodes and in that the emitting flaps are integral with and arranged in rows along each of said edges of the emission electrode. According to a suitable embodiment of the invention object the emitting ilaps are directed towards opposite directions at each of the two longitudinal edges of said emission electrode.

The invention will now be described more in detail with reference to the accompanying drawing, showing an exemplifying embodiment of the invented device and where- FIG. 1 shows a horizontal section through an electrostatic precipitator with emission electrodes made in accordance with the invention;

FIG. 2 shows a section along the line 2-2 in FIG. 1;

FIG. 3 shows a lateral view seen from the line 3-3 in FIG. 2; and

FIG. 4 shows a horizontal cross section along the line 4-4 in FIG. 2.

In the drawing 1 designates an electrostatic precipitator and designation number 2 stands for the casing of same, the precipitator being intended to be used for a horizontal gas flow and with an inlet 3 and an outlet 4. 5 designates a number of deposit electrodes arranged in parallel rows and made of plane plates and provided with stiffening bends. 6 designates emission electrodes designed in similar manner and arranged between said rows. The emission electrodes are in accordance with the invention made of a plane plate which is bent along its two longitudinal edges to function at each edge of the plane as a stitfening bend, forming a substantially right angle with respect to the plane through the row of the electrodes. The emitting flaps 7 are arranged in rows along each of said edges of the emission electrode, being struck out of the metal and integral therewith at their uncut edges, as shown in the drawings.

What I claim is:

1. An emission electrode for electrostatic precipitators in which a number of plate-like electrodes are arranged in parallel rows, said emission electrode comprising a continuous smooth plane plate bent at each longitudinal edge to form a transverse stiitening plate element, and each said transverse stiffening plate element including a flat portion extending approximately perpendicularly to said plane plate, said fiat portion having a first bent edge portion extending from one edge of said flat portion and connected to said plane plate, and a second bent edge portion extending from the opposite edge of said flat portion, and integral struck-out pointed emitting flaps extending outwardly from the bent edge portions of said fiat portion and coplanar to said flat portion.

2. An emission electrode as set forth in claim 1, in which said plane plate is disposed medially of the width of said transverse stiifening plate elements and in which said plane plate is connected to said stiffening plate elements by oblique portions which are disposed on opposite sides of said plane plate at opposite edges respectively thereof.

References Cited in the file of this patent UNITED STATES PATENTS 

1. AN EMISSION ELECTRODE FOR ELECTROSTATIC PRECIPITATORS IN WHICH A NUMBER OF PLATE-LIKE ELECTRODES ARE ARRANGED IN PARALLEL ROWS, SAID EMISSION ELECTRODE COMPRISING A CONTINUOUS SMOOTH PLANE PLATE BENT AT EACH LONGITUDINAL EDGE TO FORM A TRANSVERSE STIFFENING PLATE ELEMENT, AND EACH SAID TRANSVERSE STIFFENING PLATE ELEMENT INCLUDING A FLAT PORTION EXTENDING APPROXIMATELY PERPENDICULARLY TO SAID PLANE PLATE, SAID FLAT PORTION HAVING FIRST BENT EDGE PORTION EXTENDING FROM ONE EDGE OF SAID FLAT PORTION AND CONNECTED TO SAID PLANE PLATE, AND A SECOND BENT EDGE PORTION EXTENDING FROM THE OPPOSITE EDGE OF SAID FLAT PORTION, AND INTEGRAL STRUCK-OUT POINTED EMITTING FLAPS EXTENDING OUTWARDLY FROM THE BENT EDGE PORTIONS OF SAID FLAT PORTION AND COPLANAR TO SAID FLAT PORTION. 